Spool dings

[Jackbass]

On metal spools in the past I have used a product called lab metal by Alvin for real good dings Thanks put the spool on a spinning device drill press etc. And smoothed the filler with 220 400 and steel wool. Bake and repaint.
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[MAKAI]

Fine foam emery board for fingernails.
Then learn how to fall reels up.

[scottw]

most hardware stores stock wet/dry super fine emory paper in single sheets, perfect for smoothing dings and great to keep in your plug bag to take care of nicks that might occur while fishing and it'll put a sick point on your hook, won't be adversely affected from getting wet so you can just leave it in your bag, I like it better than a rusty file, doesn't take up any space at all